I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;to
问题描述：
I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;to
D.point ;to
答
C see sb doing sth 看见某人正在做某事（see sb do sth 看见某人做某事的全过程）
the key to the lock 固定用法 类似的还有 the answer to the question